first changes for atari5200 target

libsrc/Makefile

@@ -12,6 +12,7 @@ GEOS = geos-apple \
 
 TARGETS = apple2    \
           apple2enh \
+          atari5200 \
           atari     \
           atarixl   \
           atmos     \

libsrc/atari5200/cartentry.s

@@ -0,0 +1,13 @@
+; Cartridge entry point
+;
+; Christian Groessler, 01-Mar-2014
+
+.export         __CART_ENTRY__: absolute = 1
+.import		__CARTSIZE__, start
+.forceimport	__CART_YEAR__, __CART_NAME__
+
+.segment        "CARTENTRY"
+
+                .word   start       ; entry point
+
+.assert         (__CARTSIZE__ = $4000 || __CARTSIZE__ = $8000), error, "Cartridge size must either be $4000 or $8000"

libsrc/atari5200/cartname.s

@@ -0,0 +1,11 @@
+; default cartridge name
+;
+; Christian Groessler, 01-Mar-2014
+
+.include	"atari5200.mac"
+
+.export         __CART_NAME__: absolute = 1
+
+.segment        "CARTNAME"
+
+		scrcode "   cc65 compiled"

libsrc/atari5200/cartyear.s

@@ -0,0 +1,12 @@
+; Cartridge copyright year
+;
+; Christian Groessler, 01-Mar-2014
+
+.include	"atari5200.mac"
+
+.export         __CART_YEAR__: absolute = 1
+
+.segment        "CARTYEAR"
+
+		scrcode "98"
+

libsrc/atari5200/crt0.s

@@ -0,0 +1,55 @@
+;
+; Startup code for cc65 (Atari5200 version)
+;
+; by Christian Groessler (chris@groessler.org), 2014
+;
+
+        .export         _exit, start
+        .export         __STARTUP__ : absolute = 1      ; Mark as startup
+	.import		__RAM_START__, __RAM_SIZE__
+	.import		__RESERVED_MEMORY__
+
+        .import         initlib, donelib, callmain
+        .import         zerobss, copydata
+
+        .include        "zeropage.inc"
+        .include        "atari5200.inc"
+
+
+; ------------------------------------------------------------------------
+; Place the startup code in a special segment.
+
+.segment        "STARTUP"
+
+start:
+
+; Clear the BSS data
+
+        jsr     zerobss
+
+; initialize data
+        jsr     copydata
+
+; setup the stack
+
+        lda     #<(__RAM_START__ + __RAM_SIZE__)
+        sta     sp
+        lda     #>(__RAM_START__ + __RAM_SIZE__)
+        sta     sp+1            ; Set argument stack ptr
+
+; Call module constructors
+
+        jsr     initlib
+
+; Push arguments and call main()
+
+        jsr     callmain
+
+; Call module destructors. This is also the _exit entry.
+
+_exit:  jsr     donelib         ; Run module destructors
+
+; Reset the NES
+
+        jmp start
+

libsrc/atari5200/ctype.s

@@ -0,0 +1,5 @@
+; Character specification table.
+;
+; same as for "atari" target
+
+.include "../atari/ctype.s"

libsrc/atari5200/randomize.s

@@ -0,0 +1,17 @@
+;
+; Christian Groessler, 01-Mar-2014
+;
+; void _randomize (void);
+; /* Initialize the random number generator */
+;
+
+        .export         __randomize
+        .import         _srand
+
+        .include        "atari5200.inc"
+
+__randomize:              
+        ldx     VCOUNT          ; Use vertical line counter as high byte
+        lda     RTCLOK+1        ; Use clock as low byte
+        jmp     _srand          ; Initialize generator
+

libsrc/atari5200/y2k.inc

@@ -0,0 +1,41 @@
+;-----------------------------------------------------------
+; Y2K FIX by Alan Davis, Dennis Debro, and Ronen Habot
+;-----------------------------------------------------------
+Y2K     LDY     #$00            ; Copy BIOS opening screen to RAM
+        LDA     #$FD
+        STA     TEMPH
+        LDA     #$58            ; Assume 2 port system
+        LDX     $FD32
+        CPX     #$E8            ; Is this a 4 port?
+        BNE     Y2K0            ; Jump if not
+        LDA     #$42            ; Yes, 4 port system
+Y2K0    STA     TEMPL           
+Y2K1    LDA     (TEMPL),Y       
+        STA     $0600,Y
+        INY     
+        BNE     Y2K1
+        LDY     #$50
+        INC     TEMPH
+Y2K2    LDA     (TEMPL),Y       
+        STA     $0700,Y
+        DEY     
+        BPL     Y2K2
+        LDA     #$D4            ; Point to copyright string
+        STA     $0724
+        LDA     #$BF
+        STA     $0725
+        LDX     #$0B            ; Store NOP's @ end
+        LDA     #$EA
+Y2K3    STA     $0732,X         
+        DEX     
+        BPL     Y2K3
+        LDA     #$60            ; Store RTS opcode @ end
+        STA     $0750
+        JSR     $0600           ; Show title screen
+        LDY     #$00            ; Clear RAM from $0600-$3FFF
+        STY     $80
+        LDA     #$06
+        STA     $81
+        JSR     CLRRAM
+        RTS     
+